Etiquette teacher Myka Meier told the outlet that it's a big no-no for Kate and Meghan to don notable diamonds during the daytime unless it's for a "special occasion." The reason? The crown doesn't want the family to come across as overly "flashy."

While it can't be confirmed that this is always the case with Meghan and Kate, Meier's rule does seem to align with what the Duchesses have pulled from their jewelry boxes lately — that is, excluding their stunning engagement rings.

Likewise, Kate Middleton also took a more conservative approach to her jewelry choices when she wore silver hoops and pearl drop earrings to Wimbledon this July.

Kate Middleton dons silver hoops at Wimbledon this year.

Karwai Tang

The Duchess saved her bling-y diamond and emerald sparklers for the evening British Academy Film Awards (BAFTAs) in February.

The Duchess of Cambridge stuns in emerald and diamond statement earrings at the BAFTAs.

Max Mumby/Indigo

Of course, Kate and Meghan are really the only ones who actually know whether this daytime diamond ban is really a big deal to the Queen or not. Regardless of what regal jewels the two Duchesses choose to put on, they always manage to look gorgeous no matter what.

A Part of Hearst Digital Media
Town & Country participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites.